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地球学报  2006 

遵化豆荚状铬铁矿岩浆流变学性质

DOI: 10.3975/cagsb.2006.04.04

Keywords: 豆荚状铬铁矿,流变学性质,大洋扩张,遵化

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Abstract:

对遵化豆荚状铬铁矿中250个铬铁矿豆体的形态、大小、向椭球体转变的程度等统计分析表明,豆体在上升期间与岩浆作用的过程中伴有由等轴体(近似为球体)向椭球体转变的过程。其主要原因是豆体在相对岩浆运动的过程中,豆体的表面与岩浆之间的粘滞摩擦造成的。粘滞摩擦力的大小、作用于豆体表面的时间又取决于岩浆的粘度、豆体相对于岩浆的沉降速度、豆体半径的大小及岩浆上升的速度,所以这些因素将决定豆体变形(磨蚀、椭球化)的程度。因此,可用豆体与岩浆相互作用的物理过程来模拟豆体的变形特点,而反过来据实测的豆体变形程度数据又可推算岩浆真实的上升速度。

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